x86/boot/compressed/64: Detect and handle 5-level paging at boot-time

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commit 08529078d8 upstream.

Prerequisite for fixing the current problem of instantaneous reboots when a
5-level paging kernel is booted on 4-level paging hardware.

At the same time this change prepares the decompression code to boot-time
switching between 4- and 5-level paging.

[ tglx: Folded the GCC < 5 fix. ]

Fixes: 77ef56e4f0 ("x86: Enable 5-level paging support via CONFIG_X86_5LEVEL=y")
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: linux-mm@kvack.org
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lkml.kernel.org/r/20171204124059.63515-2-kirill.shutemov@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Kirill A. Shutemov 2017-12-04 15:40:55 +03:00 • committed by Greg Kroah-Hartman

parent 2d8262155a

commit 1bd2b30612

3 changed files with 41 additions and 4 deletions

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1

arch/x86/boot/compressed/Makefile

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16

arch/x86/boot/compressed/head_64.S

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28

arch/x86/boot/compressed/pgtable_64.c

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